Long-Term Performance of Architectural Coatings

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1 Long-Term Performance of Architectural Coatings Hylar 5 PVDF Architectural coatings may look similar when first applied; however, after years of exposure to nature and time, coatings based on Hylar 5 PVDF exhibit outstanding resistance to UV, humidity, color change, chalk, gloss loss and chemicals. Their superior performance delivers unsurpassed protection and ensures a long-lasting, durable finish. Coating properties vary widely among manufacturers and generic categories. In this bulletin, Solvay Specialty Polymers has compared what we consider typical average properties of common systems as determined by a review of literature, published reports and internal evaluations. Because of the wide variety within categories, products are available that are either better or worse than the average ratings we have listed. In any case, the supplier of any specific material should be the source of definitive information about its products. This document serves as a guideline only. Color and Gloss Retention When properly formulated using the optimal 7:3 ratio of PVDF to acrylic resin and using inorganic pigments, Hylar 5 coatings maintain their color fastness and gloss longer than all other architectural coatings. PVDF s superior ability to resist degradation caused by outdoor exposure is illustrated in Figures 1 through 3. Changes in color and gloss reported here are averages taken from panels of various colors from multiple commercial applicators. Chalking Resistance Chalking is the formation of a powdery surface condition resulting from the destruction of a coating s binder, which is caused by weathering or otherwise destructive environment. As the binder is decomposed, the pigment becomes loosely bound on the surface and resembles chalk when the finger is rubbed over it. The chalking rating is determined by the amount of material removed from the surface of the coating when rubbed (ASTM D4214), with 1 being the highest rating. Unlike PVDF coatings, a large degree of chalking was observed in the competitive coatings (Figure 4). Chemical Resistance PVDF and other fluoropolymers are noted for their exceptional resistance to chemicals, solvents and other aggressive conditions. Environmental stress from industrial pollutants, acid rain and construction materials, such as caustic mortars, detergents or acid washes, pose little threat to Hylar 5 coatings. In addition, PVDF coatings offer excellent resistance to the corrosive salt found in coastal regions. Dirt Resistance In the consumer world, the low surface energy of fluoropolymers has given rise to non-stick cookware. This same surface characteristic, along with other intrinsic properties of the coating, is utilized in Hylar 5 coating systems to reduce the attraction and retention of residue and contamination as compared to other architectural finishes. In addition to dirt resistance and dirt shedding properties, Hylar 5 coatings provide an easy-to-clean surface and excellent stain resistance over time. This reduces the need for periodic cleaning, thereby lowering maintenance costs and enhancing long-term appearance. Figure 5 illustrates the ease with which Hylar 5 coatings are cleaned after short-term Florida exposure using a simple soap water wash. Technical Bulletin Specialty Polymers

2 Figure 1: Color change after 45 south Florida exposure Delta E (Cielab) FEVE Silicone-modified polyester Hylar 5 PVDF AAMA 265 spec. max Exposure time [years] Figure 2: Gloss retention after 45 south Florida exposure Gloss retention (%) FEVE Silicone-modified polyester Hylar 5 PVDF AAMA 265 spec. max Exposure time [years] Figure 3: Superior weatherability of Hylar 5 PVDF coatings Hylar 5 FEVE Glossy Plastisol Hylar 5 F-233-GCS F-232-GCS F-297-GCS F-179-GCS F-183-NCS F-179-NCS Unexposed Exposed 2 \ Long-Term Performance of Hylar 5 PVDF Architectural Coatings

3 Figure 4: Chalk rating after 45 south Florida exposure Chalk rating Hylar 5 PVDF Silicone polyester Vinyl plastisol Urethane Exposure time [years] Figure 5: Change in lightness of washed white coatings, 6 months Florida exposure Delta L (CIELAB) Hylar 5 PVDF PVC Silicone polyester Polyurethane 1 Enamel 12 UV Resistance Of all the elements that cause architectural coatings to change or fail, UV radiation is probably the most destructive. In the presence of high moisture levels, like this found in south Florida exposure sites, the degradation caused by UV radiation is accelerated. Hylar 5 PVDF is transparent to and relatively unaffected by the sun s UV radiation, which causes lower performing coatings to lose their aesthetics over time. Photomicrographs of test panels shown in Table 1 compare the damage inflicted by the high levels of UV and humidity found in south Florida. Hylar 5 coatings are mostly unchanged, while the competitive coatings show increasing amounts of degradation over the 16 months of exposure. Performance Comparison The information presented in Table 2 was created by the National Coil Coating Association to describe the performance capabilities of various coil coating topcoats. The chart is intended to provide only general information as a wide range of performance criteria exist within any generic coating category. Ratings are only for topcoats and do not include an evaluation of primer technology. The physical properties (e.g., pencil hardness, impact resistance, flexibility) were rated using the assumption that excellent adhesion to the substrate (for one-coat systems) or to the primer (for two-coat systems) exists. Resistance properties (e.g., humidity resistance, salt spray resistance) are highly dependent upon the quality of the substrate, and in all cases it was assumed that adequately pretreated, first-quality substrate was used for the evaluation. 3 \ Long-Term Performance of Hylar 5 PVDF Architectural Coatings

4 Table 1: Performance capabilities of various coil coating topcoats Panel # 741 1X Silicone polyester Blue Panel # 745 1X Tan Panel # 747 1X Anodized Bronze Panel # 748 1X Hylar 5 PVDF Blue 4 \ Long-Term Performance of Hylar 5 PVDF Architectural Coatings

5 Table 2: Comparative properties and performance chart Properties ASTM Method Plastisol Solution Interior Use Exterior Use Impact resistance D Mar resistance D3363, D Metal marking resistance No method Resistance to pressure D mottling in coil Solvent (MEK) resistance D542 N/A Grease and oil resistance D542, D Stain resistance No method Resistance to acidic/ D2248, D caustic conditions 3 5 Resistance to water immersion D Humidity resistance D1735, D2247, D4585, G6 Abrasion resistance D46, D Resistance to industrial pollution D138, G Corrosion resistance B117, G (salt spray) Flexibility/drawability D2794, D3281, D4145, D522, D4146 Dry heat resistance No method Gloss retention, 1 years Florida, G7, D114, D N/A 3-4 Chalk, 1 years Florida, G7, D114, D N/A 3-4 Color retention, 1 years Florida, G7, D114, D N/A = Excellent, 4 = Very good, 3 = Good, 2 = Fair, 1 = Poor Courtesy of the National Coil Coating Association, 5 \ Long-Term Performance of Hylar 5 PVDF Architectural Coatings

6 Table 2 Continued: Comparative properties and performance chart Polyvinylidene Fluoride ( PVDF ) Properties ASTM Method Silicone Latex Polyurethane Impact resistance D Mar resistance D3363, D Metal marking resistance No method D Resistance to pressure mottling in coil Solvent (MEK) resistance D Grease and oil resistance D542, D Stain resistance No method Resistance to acidic/ D2248, D caustic conditions Resistance to water immersion D Humidity resistance D1735, D2247, D4585, G6 Abrasion resistance D46, D Resistance to industrial pollution D138, G Corrosion resistance B117, G (salt spray) Flexibility/drawability D2794, D3281, D4145, D522, D4146 Dry heat resistance No method Gloss retention, 1 years Florida, G7, D114, D Chalk, 1 years Florida, G7, D114, D Color retention, 1 years Florida, G7, D114, D = Excellent, 4 = Very good, 3 = Good, 2 = Fair, 1 = Poor Courtesy of the National Coil Coating Association, SpecialtyPolymers.EMEA@solvay.com Europe, Middle East and Africa SpecialtyPolymers.Americas@solvay.com Americas SpecialtyPolymers.Asia@solvay.com Asia Pacific Material Safety Data Sheets (MSDS) are available by ing us or contacting your sales representative. Always consult the appropriate MSDS before using any of our products. Neither Solvay Specialty Polymers nor any of its affiliates makes any warranty, express or implied, including merchantability or fitness for use, or accepts any liability in connection with this product, related information or its use. Some applications of which Solvay s products may be proposed to be used are regulated or restricted by applicable laws and regulations or by national or international standards and in some cases by Solvay s recommendation, including applications of food/feed, water treatment, medical, pharmaceuticals, and personal care. Only products designated as part of the Solviva family of biomaterials may be considered as candidates for use in implantable medical devices. The user alone must finally determine suitability of any information or products for any contemplated use in compliance with applicable law, the manner of use and whether any patents are infringed. The information and the products are for use by technically skilled persons at their own discretion and risk and does not relate to the use of this product in combination with any other substance or any other process. This is not a license under any patent or other proprietary right. All trademarks and registered trademarks are property of the companies that comprise Solvay Group or their respective owners. 213 Solvay Specialty Polymers. All rights reserved. D 3/212 R 9/213 Version 2.1